John j



(No Model.)

J. J. OBRIBN. BOILBR. No. 600,443. Patented Mar. 8, 1898.

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j" l y I @ym EefyJJ/ Z Z W///////////// W/////////////////////:\\\\\\\\V f l Z Nrrnn SrAr-ns JOIIN J. OBRIEN, OF ST. LOUIS, MISSOURI,ASSIGNOR TO THE JOHN OBRIEN BOILER VORKS COMPANY, OF SAME PLACE.

BOILER.

SPECIFICATION forming part of Letters Patent No. 600,443, dated March 8,1898.

Application tiled October 18,1 897.

To @ZZ whom, it may concern,.-

Beit known that I, JOHN J. OBRIEN, a citizen of the United States,residing at the city of St. Louis, in the State of Missouri, haveinvented certain new and useful Improvements in Boilers, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming a part of this specification.

My invention relates to an improved manner of forming up the manholes,hand-holes, dsc., of boilers, whereby there is provided a strong,secure, and perfect seat for the covers of these holes, and Iwherebythere is provided a broad bearing for the bodyface of the cover.

My invention consists in features of novelty hereinafter fullydescribed, and pointed out in the claim.

Figure I is a section showing part of a boiler and a plate or cover Withits supporting bridges and bolts and illustrating my invention, thesection being taken on line I I, Fig. II. Fig. II is a section taken online II II, Fig. I. Fig. III is an enlarged detail section with theplate or cover removed. Fig. IV is a detail sectional view with the ringremoved. Fig. V is a detail inside view of part of the boiler at themanhole.

l represents part of the boilerhaving a manhole or hand-hole 3represents the plate or cover of the manhole, Which has an inner flange4E, having a flat seat-face 5. The plate or cover has, further, a flange6 with a iat body shoulder or The cover or plate is held in position iface 7.

Serial No. 655,589. (No model.)

by means of a bridge or bridges 8 and bolt or bolts 9, as usual.

The edge of the boiler-plate surrounding the hole 2 is bent inwardly andfolded back, 4o forming a flat surface l0, against which lies the gasketor packing-ring l1, that is located between the face 10 and the flange lof the cover or plat-e3. This inturned edge of the boilerplate is foldedso as to leave a space 12 45 between it and the body of the plate, asshown in Fig. IV. In the space 12 is located a forming-ring 13, or, inother Words, the inturned edge is folded over a forming-ring 13, therebyproviding a Wide bearing for the body face 5o or shoulder '7 to fitagainst, so that the cover Y is supported in position While the bolts 9are being tightened.

I claim as my invention- A boiler comprising a plate l formed With 55 ahand-hole 2 and With an inturned edge surrounding the hand-hole andproviding a ringspace 12 and a flat face lO, the forming-ring 13 locatedin the space and over Which the inturned edge is bent, the packing-ring11 it- 6o ting against the flat face of the inturned edge,

Vand the cover formed With an inner flange 4,

havinga flat face 5 seating against the packing-ring, and an outerflange 6 havinga Wide shoulder 7 tting against the inner edge of 65 thepacking-ring and against the bent poi"- tion of the inturned edge 5substantially as described.

JOHN J. OBRIEN. In presence of- E. S. KNIGHT, STANLEY S'roNEn.

